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Issue 4, 2012
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Thermo-responsive adhesion properties of composite hydrogel microcapsules

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The present work describes the synthesis and characterisation of thermo-responsive microcapsules consisting of poly-N-isopropylacrylamide (PNIPAM) hydrogel, hydrophilic citrate-stabilized super-paramagnetic iron oxide nanoparticles (SPIONs) that perform the function of a local heat source and hydrophobic nanoparticles (either SiO2 or oleic acid-coated SPIONs) that stabilize the microcapsule surface. The microcapsules have been synthesized by the inverse Pickering emulsion polymerisation method. The effect of iron oxide concentration in the hydrogel on the shape, size, shrinkage ratio and heating rate of the microcapsules has been systematically investigated. The adhesion properties of the composite microcapsules towards a range of substrates have been characterised in a microfluidic flow cell and it was found that the temperature-induced change of the microcapsule size is an effective way of controlling adhesion. The induction heating of the embedded SPIONs makes it possible to control adhesion remotely in environments where macroscopic heating is not possible.

Graphical abstract: Thermo-responsive adhesion properties of composite hydrogel microcapsules

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Publication details

The article was received on 19 Sep 2011, accepted on 26 Oct 2011 and first published on 23 Nov 2011

Article type: Paper
DOI: 10.1039/C1SM06783D
Citation: Soft Matter, 2012,8, 1087-1095

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    Thermo-responsive adhesion properties of composite hydrogel microcapsules

    V. Tokárová, A. Pittermannová, J. Čech, P. Ulbrich and F. Štěpánek, Soft Matter, 2012, 8, 1087
    DOI: 10.1039/C1SM06783D

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